Budolph s



(No Model.)

' R. S. HUNZEKER.

DIE FOR MAKING CARRIAGE SPRINGS.

No. 285,623. Patented Sept. 25, 1883.

INVENTOR.

WITNESSES J (53 QM M ATTORNEY.

RUDOLPH S. HUNZEKER, OF PITTSBUBG, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOWILLIAM A. HERRON, WM. J. PATTERSON, AND RUFUS H. HERRON, AI rL OF SAME PLACE.

DIE FOR MAKING CARRIAGE-SPRINGS.

SPECIFICATION forming part of Letters Patent No. 285,623, dated September 25, 1883.

\ Application fi1ed Apri11'2,1883. (No model.)

To all whom it may concern.-

Be it known that I, RunoLrn S. HUNZEKER, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain newand useful Improvements in Dies for Making Garriage-Springs, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention consists of an improvement in dies for making carriage'springs, and also in a new process of tempering springs, all of which will be understood from the following description and claims.

In the accompanying drawings, Figure l is a plan view of my machine. Figs. 2, 3, and 4 are detached views.

Upon a table, A, is placed a die, B, of suitable shape, for bending the spring. This die is made hollow and cooled by a constant flow of water through the same. The straight piece or plate of steel is placed in front of the die, as shown at O in broken lines. Then by means of a central cam, D, the follower E is driven home to form the central bend of the spring. F, the two followers G are driven forward upon the ends of the spring, thus completing its shape. In the same machine is another die, H and I, for stamping out a cap, K, Fig. 4, to

Then by means of the two side cams,

fit over the ends of two springs, A, when put together, forming a double elliptic spring. By using this water-tempering die the spring is bent or set, and also tempered at the same time by once heating, while in the old way springs are usually heated three .times: first,

to bend and set the spring; second, to temper the same, and, third, to draw the temper, all

ofwhich burns and injures the steel and spring.

What I desire to claim and secure byLetters Patent is 1. In a spring-bending machine, a hollow die adapted to have a constant current of water fiow through the same without contact with the heated metal, whereby the spring may be bent, set, and tempered at the same 

